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Title:
Pressure gradients, shell-crossing singularities and acoustic oscillations - application to inhomogeneous cosmological models
Authors:
Bolejko, K.; Lasky, P. D.
Affiliation:
AA(School of Physics, University of Melbourne, Parkville, Victoria 3010, Australia; Nicolaus Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland), AB(School of Mathematical Sciences, Monash University, Wellington Road, Melbourne, Victoria 3800, Australia; Theoretical Astrophysics, Eberhard Karls University of Tübingen, Tübingen 72076, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 391, Issue 1, pp. L59-L63. (MNRAS Homepage)
Publication Date:
11/2008
Origin:
MNRAS
MNRAS Keywords:
instabilities, cosmology: theory, large-scale structure of Universe
DOI:
10.1111/j.1745-3933.2008.00555.x
Bibliographic Code:
2008MNRAS.391L..59B

Abstract

Inhomogeneous cosmological models have recently become a very interesting alternative to standard cosmology. This is because these models are able to fit cosmological observations without the need for dark energy. However, due to inhomogeneity and pressureless matter content, these models can suffer from shell-crossing singularities. These singularities occur when two shells of dust collide with each other leading to infinite values of the density. In this Letter, we show that if inhomogeneous pressure is included then these singularities can be prevented from occurring over the period of structure formation. Thus, a simple incorporation of a gradient of pressure allows for more comprehensive studies of inhomogeneous cosmological models and their application to cosmology.
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